A211944 Number of distinct finite languages over 3-ary alphabet, whose minimum regular expression has reverse Polish length 2n-1.
5, 15, 85, 589, 4512, 37477, 328718, 2998039
Offset: 1
Links
- Hermann Gruber, Jonathan Lee, and Jeffrey Shallit, Enumerating regular expressions and their languages, arXiv:1204.4982v1 [cs.FL], 2012.